#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
 
int g_val =100 ;
 
int main()
{
     pid_t id = fork();
    if(id < 0)
    {
         perror("fork");
        return 0;
    }
     else if(id == 0)
    {
        //child
        g_val+=100;
        printf("child[%d]: %d : %p\n", getpid(), g_val, &g_val);
    }
    else
    { 
       //parent
       printf("parent[%d]: %d : %p\n", getpid(), g_val, &g_val);
    }

    sleep(1);
    return 0;
}
